Means for removing warp threads from the lease in warp-thread tying and like weaving machinery



Oct. 14, 1930. u. BISCHOF 1,778,480

. MEANS FOR REMOVING WARP THREADS FROM THE LEASE IN WARP THREAD TYING' AND LIKE WEAVING MACHINERY Filed May 29, 1929 2 Sheets-Sheet 1 M/ve Basal/Zara Oct. 14, 1930. u. BISCHOF 1,773,480

MEANS FOR REMOVING WARP THREADS FRO" THE LEASE I WARP THREAD TYINQ AND LIKE WEAVING IACHINERY I Filed May 29. 1929 2 Sheets-Sheet 2 Patented Oct. 14, 1930 UNITED STATES ULRICH BISCHOF, F AARAU, SWITZERLAND MEANS FOR REMOVING WARP THREADS FROM LEASE IN WARP-THREAD TYING AND LIKE WEAVING MACHINERY Application filed May 29, 1929, Serial No. 367,026, and'in Switzerland October 4, 1928.

For taking away the threads from the cards in warp thread tying and like weaving machinery various devices are known, which are very elaborate and complicated and in which consequently disturbances are very liable to occur.

I In other devices for the same purpose, shaft cards are introduced into cranked nipper tubes and pulled through them, the threads to be removed being laid upon these cords crosswise. These nipper tubes have however the disadvantage that in consequence of their being cranked the healed shaft cords introduced into the former and pulled through them are injured and thereby destroyed in a short time. Such devices also have the great disadvantage that they do not'separate sufliciently, or even do not separate at all,'those threads that hang together owing to fibres and the like, thereby giving rise to disturbances.

The taking away of the ends of the threads which arise during the tying from the threads previously presented by the nipper tubes, has hitherto been effected by elaborate appliances which make the machine complicated and difficult to superintend.

The device according to the present invention, in which the cords are likewise employed for the two warps, and tubes provided with tensioning ribs for receiving these cords, ob-

viates the abovementioneddisadvantages and permits of a positive separation of the threads from one another and a removal of each thread individually, owing to the fact that between the tubes, upon an oscillatable and axially displaceable shaft, is arranged a twoarmed thread divider with sharp longitudinal edges, which in each of its two initial positions is placed obliquely to and in front of the 40 foremost of the threads to be taken away from the lower and upper warps, the two arms of the thread divider bearing at the same time on the two warps strongly crossed by the tubes in such a way that the thread divider during one revolution swings against the foremost threads to be taken away, whereby the thread divider arms penetrate at the same time between the foremost and foremost but one threads of the lower and upper warps, for the purpose of supplying and delivering the foremost threads thus simultaneously seized, by a displacement of the thread divider along its axis of rotation, to the knotting members, then swing into the opposite oblique initial position, and seize the next foremost threads during the swing in the reverse direction.

lVith this device the result is obtained that the removal of the threads is effected in a constantly alternating direction of rotation by one and the same thread divider at the same time from both warps in an exceedingly simple and reliable manner. The above mentioned tubes comprise in a similar manner longitudinal ribs designed for the tensioning and loosening of the warp threads. Now these longitudinal ribs preferably project, for the passage of the heald shaft cord, laterally beyond the ends of the tubes, and are shaped with a point at these ends, whereby a reliable engaging of the tubes in the warp is obtained, and any injury to the warp threads is prechided.

The usual levers mounted fast upon the tubes preferably each comprise a pin, which pins engage directly in slots in a rotary disc, so that by a slight rotation of this disc the opposite longitudinal ribs on the tubes tension the threads lying upon them which are not to be taken away and loosen the others, to enable those of the latter that are foremost in the two warps to be easily seized. The rotation of the disc is thereupon efiiected in the reverse direction, the longitudinal ribs of the tubes then bearing upon the other side, and tightening the previously loose threads and letting the others loose, to enable the foremost of these threads to be taken away, so that with this device a continuously alternating method of working is repeated, thereby simplifying the machine.

A further simplification of the machine may be obtained by arranging the tubes, and also the disc that sets the tubes in rotation and the shaft with the thread divider, in a common holder, a toothed disc provided with a hook being preferably rotatably arranged uponthe same holder, in such a way that the hook executes a circulating movement outside the tubes for the purpose of seizing the thread ends left behind during the tying and lying in the lease and laying them downwards, where they are then held fast by the gripper. One constructional example of the inven tion is illustrated in the accompanying drawin s, wherein ig. 1 is a front elevation of the device for taking away the warp threads, only such parts being shown as are required to make the operation of the invention clear.

Fig. 2 is a section on the line 02-22 of Fig. 1.

Fig. 3 is a plan view of the device with the shaft broken away'and the cordrdrawn in.

Fig. 4 illustrates the removal of the thread ends from the lease, some par-ts being in sec tion and one gripper being partly shown.

Fig. 5 is a view of the tappet for the thread divider with the actuating lever. f Figs. 6 and 6 are viewsin front and edge elevation of a toothed disc with ahook for taking away the endsof the threads.

Fig. 7, 7 and 7 are plan, side and end views of the nipper tube.

Figs. 8, 8 and 8 are similar views of the thread divider.

Fig. 9 is a view showing the nipper tube with the cord drawn in and the engagement of its tip in the lease.

Figs. 10-18 illustrate the method of working of the thread divider for taking the threadsout of the lease,

Figs; 10-15 showing the nipper tubes in section and Figs. 1618 showing them in plan.

In Figures 1, 2 and 3, 1 denotes a tube holder, in which nipper tubes 2, 3, 4 and 5 are rotatably arranged. To the latter are secured levers 6, 7 8 and 9, of which the pins 10, 11, 12and 13 engage in a common disc 14. This disc is rotatably mounted upon the tube holder 1 and is axially held by a ring 15. As Figures 7' and 9 show, the nipper tube is provided with a tip 16sharpened on both sides projecting laterally beyond its end, whereby an engagement of the tip in the lease 17 is obtained close beside a cord 16, without injuring the threads. -A'longituinal rib 18 (Fig. 7) fitted to the nipper tube enables the warp threadsof the lease located upon one side or the other of the nipper tube to be tensioned. In a slot in the disc 14 (Figs. 1 and'2) there engages a pin 20 secured to a lever 19, the disc 14 being rotated in the event of a lateral movement of the lever 19, for the purpose of setting the nipper tubes 2, 3, 4 and 5, with their ribs 18, in oscillation. A two-armed thread divider 21 (Figs. 1, 3, 4, and 8) mounted fast upon a shaft 22, is rotatably and slidably arranged inthe tube holder 1. Upon the other end of the shaft 22 is mounted fast a tappet 23 (Figs. 1 and 5), with a slot, in

which there engages a prism 26 carried by a lever 24 a-nd rotatably mounted upon a pin 25. In the event of a sideways movement of the lever 24, the thread divider 21 is displaced in the longitudinal direction of the shaft 22 with the latter. The tappet 23 has a stationary pin 27, which rotatably carries a prism 28. The latter engages in a slot in a lever 29, which in the event of a sideways movement sets the thread divider 21 in oscillation about the axis of the shaft 22. The thread divider 21 has two sharp longitudinal edges and is two-armed for the purpose of enabling it to seize simultaneously and reliably one thread of the lower warp 30 and one thread of the upper warp 31. Upon the tube holder v1 is rotatably arranged a toothed disc 32 (Figs. 1 and 3) carrying a hook'33 and this 'discis held fa'stin an axial direction by an angle 34 engaging in a groove in the disc 32 and secured upon the tube holder 1, without hindering the rotation. A similarly toothed disc 35 engagingin the teeth of the disc 32 is secured to a shaft 36 journalled in a bracket 37, while upon the other end of the shaft 36 is mounted fast av chain wheel'38, which is connected by a chain 39 with a second chain wheel mounted fast upon the driving shaft of the knotting carriage, (not shown). During the rotation of the disc 22 the hook 33ex ecutes a revolving movement about the nipper tubes. Thetube holder 1, and also the levers 19, 24 and 29, are arrangedon the known knotting carriage which slides relatively to the warp. I

The method .of working of the apparatus described is as follows Y The cords 16, known in themselves, which are introduced, in a manner likewise known, into'the warps and form the lease, are. introduced into the nipper tubes 2, 3, 4 and 5, pulled through them, and secured on'both sides outside the machines. The nipper tubes, with the longitudinalribs located opposite to one another in a horizontal direction, then engage with their points, during the'displacement of the knotting carriage, in the lease formed by the cords, the threads of the two warps 30 and 31 bearing snugly above and below the nipper tubes in a crossed po sition, as shown in Figures 3 and 4. As soon as the threads bear on the thread divider 21, the latter takes up the position shown in Figures 10 and 16, whereupon the disc 14 executes a slight rotation andthereby sets in oscillation the longitudinal ribs. 18 (Fig. 7) of the nipper tubes, so'that thelatter assume the position shown in Figure 11. The thread which is not to betaken, and which is located behind the thread divider 21, isv thus placed under tension During the rotation which is thereupon executed by the thread divider about the'axis, owingito a lateral movement of the lever 29, the thread divider engages with its two arms atthe same time, in the case of both warps, "between the foremost and foremost but one crossed threads, and thereby comes into the position shown in Figures 12 and 17 the separated threads 41 and 41 of the two warps having assumed the position shown in Figs. 3, 8,12 and 17 in front of the thread divider. Owing to the displacement of the thread divider in the direction of its axis caused by the lateral movement of the lever 24 that then ensues, the two threads seized are taken away from the others and presented for tying, as shown in Figure 18. Upon the two front threads being taken away, the next following threads,

which might cling by their fibres to the foremost threads, are prevented by the tension caused by the longitudinal ribs from accompanying the former threads. After the threads presented by the thread divider have been tied, the thread divider again executes a rotation in the same direction as before and then comes, during the backward axial displacement, into the position according to Figure 13, which is opposite to that of F ig ure 10, and bears upon the foremost threads but one. Thereupon an oscillation of the longitudinal ribs18 occurs, in the direction opposite to that of the first oscillation effected, whereby the foremost threads but one, located behind the of the thread divider, are placedunder tension, as illustrated in Figure 14:. During the backward rotation of the thread divider, which then ensues, the thread divider again sn ings back again, so

as to penetrate between the foremost thread and the foremost thread but one, and then assumes the position shown in Figures 15 and 17, whereupon it presents the threads seized in this manner and lying in front of it, by an axial displacement, for tying, as shown in Figure 18. The series of operations is continuously repeated in this way in an alternating manner.

During the tying of the threads the latter are cut off in a known manner at the tying point, whereupon the hook 33 arranged on the toothed disc 32 and revolving round the nipper tubes seizes the thread ends lying in the lease and held fast by the gripper 40, pulls them downwards out of the lease and lays them down, whereupon they remain hanging on the gripper.

It will be obvious that owing to the device described the disadvantages that have hitherto been experienced are obviated, and the removal of the threads from the lease is effected with the utmost security. The device is distinguished by great simplicity.

l/Vhat I claim is 1. A device for taking away the warp threads from the lease in machines for knotting together the threads of an upper and a lower warp, comprising, cords for the warp, tubes receiving the cords and engaging in the upper and lower warps, an oscillatable and axially displaceable shaft, a thread divider mounted on the said shaft, two arms rigid with the thread divider, sharp longitudinal edges on the thread divider, the thread divider being adapted to be placed alternatively in either of two initial positions obliquely to and in front of the foremost of the threads to be taken'away from the upper and lower warps, with its two arms at the same time bearing on the two warps strongly crossed by the tubes, means for oscillating the shaft so that the thread divider swings against the foremost of the threads to be taken away .and its arms penetrate between the foremost and the foremost but one threads of the lower and upper warps simultaneously, and means for displacing the thread divider along its axis to deliver the threads taken by it for knotting, the shaft oscillating means being adapted to oscillate the shaft and the thread divider in the opposite direction, after the delivery of the said threads for knotting, to bring the thread divider into its other initial position, and the thread divider being adapted to seize, the next foremost threads during its return oscillation.

2. A device as claimed in claim 1, in which the warp threads to be knotted are taken away by the two tubes lying at right angles to the crossed warp threads, further comprising longitudinal ribs on one side of each tube,

projecting beyond the ends of the tubes and terminating in a point, the threads of each warp being crossed and passing over two tubes arranged in the same plane as the warp, and the longitudinal ribs being adapted to tension the threads that are not to be taken. away, by rotation of the tubes.

3. A device as claimed in claim 1, in which the warp threads to be knotted are taken away by the two tubes lying at right angles to the crossed warp threads, further comprising longitudinal ribs for the passage of the cord on one side of each tube, projecting beyond the ends of the tubes and terminating in a point, the warp threads each running over two tubes arranged in the same plane as the warp, and the longitudinal ribs being adapted to tension the threads that are not to be taken away, a lever mounted fast on each end of each tube, a pin carried by each lever, a rotatable disc formed with a number of slots, each of the said pins engaging directly in one of the slots in the disc, and means for imparting to the disc and thereby to the tubes a slight rotation in one direction and the other alternately, so that during the rotation in one direction the longitudinal ribs arranged opposite to one another on the tubes tension the threads lying crossed on the latter which are not to be taken away and unbend others, and during the rotation in the opposite direction, after the tying of the threads first taken away, the longitudinal ribs tighten the previously not bent threads and unbend the others for being taken away.

4. A device as claimed in claim 1, in which the warp threads to be knotted are taken away by the two cords lying at right angles to the crossed warp threads, further comprising longitudinal ribs for the passage of the cord on one side of each tube, projecting beyond the ends of the tubes andterminating in a I 7 point, the warp threads each running over two v tubes arranged in the same plane as the Warp, and the longitudinal ribs being adapted to tension the threads that are not to be taken away, a lever mounted fast on each tube, a pin carried by eachlever, a rotatable disc formed 10 with a number of slots, each of the said pins engaging directly in one of the slots in the disc, means for imparting to the disc and therebyto the tubes a slight rotation in one direction and the other alternately, so that during the rotation in one direction the longitudinal ribs arranged opposite to one another 1 on the tubes tension the threads lying on the latter which are not to be taken away and loosen the others, and during the rotation in the opposite direction, after the tying of the threads first seized, the longitudinal ribs tighten the previously loosened threads and let the others loose, a holder upon which the tubes-, the rotatable disc-and the shaft with the thread divider are directly and in common mounted, a toothed disc rotatably mounted upon the holder having a hook adapted to execute a revolving movement outside the tubes, to seize the thread ends left behind after the tying and to lay them down, and a thread gripper adapted to hold the thread ends fast after they have been laid down by the hook.

In testimony whereof I have affixed my signature.

1 ULRICH BISCHOF. 

